<!DOCTYPE html>
<html>
    <head>
    </head>
    <body>
        <form action="/" method="post">
            <p>Check some colors</p>
            <label for="red">Red</label>
            <input type="checkbox" name="colors[]" value="red" id="red"/>
            <label for="green">Green</label>
            <input type="checkbox" name="colors[]" value="green" id="green"/>
            <label for="blue">Blue</label>
            <input type="checkbox" name="colors[]" value="blue" id="blue"/>
            <input type="submit"/>
        </form>
    </body>
</html>